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Giddiness...if there is definite sense of rotation, it is vertigo.
Hopefully, ECG, blood pressure, blood counts and other investigations have been done and were normal?
The body's balancing mechanism is in the inner ear
. An ENT (Ear Nose Throat) specialist is the one to see - especially in the presence of tinnitus
. They have special tests to analyse.
If there are no clues, you have to be followed up by a neurologist
. MRI / MRA may be necessary.
In the mean time, continue your vertin (betahistine
Wishing you speedy recovery